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8 Real-Time Kinematic (RTK) Surveying
96 5700 GPS Receiver User Guide
Applications
Summary of RTK positioning modes
Table 8.1 summarizes the RTK positioning modes available in the
5700 receiver. Accuracy figures are 1 sigma and assume a 1 second
data link delay.
8.2.5 Critical Factors Affecting RTK Accuracy
The following sections present system limitations and potential
problems that could be encountered during RTK operation.
Reference receiver type
Optimal RTK performance is achieved when using 5700 receivers at
reference and rover sites. However, the 5700 receiver is compatible
with all other Trimble RTK systems, so you can use a 5700 receiver as
the rover and a different receiver type as the reference station.
C
Warning – Trimble recommends that you only use a Trimble reference
receiver with 5700 rovers. If you use a non-Trimble reference receiver,
initialization reliability and RTK performance may be degraded.
Table 8.1 Comparison of RTK positioning modes
RTK mode Update rate
(Hz)
Latency
(seconds)
Minimum data
link (baud)
Accuracy (RMS)
Synchronized 1 0.5 – 2.5 2400 Horizontal: 1 cm + 1 ppm
Vertical: 2 cm + 2 ppm
Low Latency 5 0.02 2400 Horizontal: 2 cm + 2 ppm
Vertical: 3 cm + 2 ppm